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# Scaling Filters

These constants specify the scaling filters used by [`magnificationFilter`](/documentation/QuartzCore/CALayer/magnificationFilter) and [`minificationFilter`](/documentation/QuartzCore/CALayer/minificationFilter).

## Topics

### Constants

[`kCAFilterLinear`](/documentation/QuartzCore/CALayerContentsFilter/linear)

Linear interpolation filter.

[`kCAFilterNearest`](/documentation/QuartzCore/CALayerContentsFilter/nearest)

Nearest neighbor interpolation filter.

[`kCAFilterTrilinear`](/documentation/QuartzCore/CALayerContentsFilter/trilinear)

Trilinear minification filter. Enables mipmap generation. Some renderers may ignore this, or impose additional restrictions, such as source images requiring power-of-two dimensions.


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